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Revealing mistake: When Buck and the gang ride away from the saloon in Dallas where JC made a few new 'friends', the footage is sped-up for a second just as soon as James Caan jumps on his horse. (00:05:50)

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Plot hole: There is a pivotal moment when Duke poolside casually says; "remember that night when..." That is a mighty strange way for him to mention the very last time the two met, barely two weeks earlier. Miles was not even supposed to be in the country, but Duke, who later jumps straight to casual blackmail once he gets the Google alert about Andi, never mentions that to Miles before or since. Miles cut him off pretending he meant "Anderson Cooper", but for the rest of the movie he struggles and has no leverage on Miles to the point that he pimps his girlfriend out to him. Furthermore, he mentioned the "pancaking" to the other friends, but somehow never mentioned it was Miles. If he was not going to take advantage of that, then he had no reason at all to keep the secret, especially with the lot of them hanging out for an hour waiting at Andi's door. Anyone would have mentioned the fact already back then, or if they realised it was important, would have already started to use it.

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Continuity mistake: Miles tries to rally the troops after Helen delivered the line about him being ruined. He calls out "Gang?" Lionel is staring into space facing away from him, then in close-up he is still staring into space, but turned more towards him. (02:09:40)

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Audio problem: Helen reminds Miles the line he used "To forever be remembered in the same breath as the Mona Lisa." The line is said in the span of a couple different angles; when she says the word "in the same", the camera is behind her, and you can see that her jaw is not moving. (02:09:15)

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Stupidity: Of course, it's a movie with a heavy comedic tone and it's a rather cathartic scene, but still it's worth noting that Benoit Blanc had no way to know that making the whole HOUSE (full of glass shrapnel, too) explode wouldn't gravely injure or kill anyone. What a ruthless fellow.

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Continuity mistake: The bloodstains on Helen's top change midway through the ending. For instance, when she walks towards Miles after smashing most of the glass sculptures to eventually show him her trump card, she has a visible red spot on her right breast (which you could see earlier even when she was wearing her blazer), gone when she gets up from the floor after the explosion. (02:05:00)

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Continuity mistake: In the close-up of Helen igniting the alcohol on the floor, she moves the arm away from the floor and all the way out of frame, appearing also to get up from her kneeling position. A few seconds later in the wider view of the room she is still with her hand down. (02:04:15)

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Continuity mistake: When Helen is bashing the bar, the gestures of the other characters in the background are inconsistent from shot to shot (just look at Kate Hudson and Kathryn Hahn's reaction shots, for instance). Same when a few seconds later she throws pillows in the fire. (02:04:00)

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Continuity mistake: Helen pleads someone to say "I saw the napkin before he burned it." In the background, Miles is standing, hands down his sides. The camera cuts awa a split second on Claire and Lionel, and then there's a close-up of Edward Norton leaning with the back, and the palms of his hands, against the table. Same few moments later. (02:00:10)

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Other mistake: In the original version and in the flashback, Benoit Blanc's delivers the lines about the "loaded gun on the table" in a different way and gestures differently throughout it. (01:56:10)

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Plot hole: It's an established fact that the culprit is an idiot (actual quote), but still, not a COMPLETE idiot. Some things such as keeping the envelope as some sort of trophy are in line with the hubris of villains, but there's absolutely no reason at all why he would still have in the back pocket of his pants Duke's phone after having a ton of time to get rid of it (he got rid of the gun and a pair of gloves he had the time to go look for in the dark too), especially in a spot so visible and being known for not owning any phone himself. (01:53:40)

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Other mistake: During the first part of the movie, the Mona Lisa shield is triggered by all sorts of acute sound; phone alerts, speaking too loudly. Somehow it is also never released (one wonders how can it detect when the threat is over). At any rate, after the gag has run its course, in the third act the protection is not triggered anymore except when the plot makes it convenient (the lighter). (01:57:40)

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Other mistake: In the close-up of the article about Andi's death (the second time we see it, during the denouement, since the first time when Helen sees it the framing is too tight to notice), her full name (Cassandra) is misspelled in the body of the article ("Casandra"). It also mentions her sister Helen; if her identity is so well known and accessible, considering how high profile the trial was, it's borderline insane that nobody would know about her; the media would have been all over her. (01:54:00)

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Continuity mistake: When Helen reveals herself holding the envelope on the stairs, she holds it with one, then two hands in the two separate shots. (01:52:00)

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Audio problem: The second time we hear everyone reacting to Andi's death, the timing of the lines is different and Edward Norton says "God, Andi." (01:46:00)

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Continuity mistake: In the flashback, "Andi" is dead with her right arm on the last step in most shots (as she was the first time we saw the scene) or the one below (like when Blanc is crouching and curses saying "Sh*tballs." (01:45:20)

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Other mistake: The way Helen and Blanc clash into each other during the blackout differs radically between the first time and the lengthy flashback; in the flashback she is calling his name, and he tells her "There's great danger." Neither happened the first time we saw the scene. (01:07:00 - 01:43:20)

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Plot hole: In the flashback, Whiskey fired the speargun at Helen at the bungalow away from the main house as she was fleeing at the beginning of the blackout. She has no light source with her, but somehow in the earlier showing of the events she was one of the first people to pop up at the party room seconds after the blackout started, and with a loaded speargun. (01:06:00)

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Continuity mistake: In the argument between Birdie and Peg that Helen happened to record, Kate Hudson's hands are in a different position in her lap in the reverse shots when she says "There's no stopping it" and just after she admits "It's my secret phone." (01:37:25)

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Continuity mistake: In their bathroom consultation, Blanc compliments Helen about the 'interesting stuff about Whiskey'; he is leaning on the sink, and then suddenly he's gesticulating with that same hand. (00:01:29)

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